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/***************************************************************************************************
Zyan Core Library (Zycore-C)
Original Author : Florian Bernd, Joel Hoener
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
***************************************************************************************************/
/**
* @file
* @brief General helper and platform detection macros.
*/
#ifndef ZYCORE_DEFINES_H
#define ZYCORE_DEFINES_H
/* ============================================================================================== */
/* Meta macros */
/* ============================================================================================== */
/**
* @brief Concatenates two values using the stringify operator (`##`).
*
* @brief x The first value.
* @brief y The second value.
*
* @return The combined string of the given values.
*/
#define ZYAN_MACRO_CONCAT(x, y) x ## y
/**
* @brief Concatenates two values using the stringify operator (`##`) and expands the value to
* be used in another macro.
*
* @brief x The first value.
* @brief y The second value.
*
* @return The combined string of the given values.
*/
#define ZYAN_MACRO_CONCAT_EXPAND(x, y) ZYAN_MACRO_CONCAT(x, y)
/* ============================================================================================== */
/* Compiler detection */
/* ============================================================================================== */
#if defined(__clang__)
# define ZYAN_CLANG
# define ZYAN_GNUC
#elif defined(__ICC) || defined(__INTEL_COMPILER)
# define ZYAN_ICC
#elif defined(__GNUC__) || defined(__GNUG__)
# define ZYAN_GCC
# define ZYAN_GNUC
#elif defined(_MSC_VER)
# define ZYAN_MSVC
#elif defined(__BORLANDC__)
# define ZYAN_BORLAND
#else
# define ZYAN_UNKNOWN_COMPILER
#endif
/* ============================================================================================== */
/* Platform detection */
/* ============================================================================================== */
#if defined(_WIN32)
# define ZYAN_WINDOWS
#elif defined(__EMSCRIPTEN__)
# define ZYAN_EMSCRIPTEN
#elif defined(__APPLE__)
# define ZYAN_APPLE
# define ZYAN_POSIX
#elif defined(__linux)
# define ZYAN_LINUX
# define ZYAN_POSIX
#elif defined(__FreeBSD__)
# define ZYAN_FREEBSD
# define ZYAN_POSIX
#elif defined(sun) || defined(__sun)
# define ZYAN_SOLARIS
# define ZYAN_POSIX
#elif defined(__unix)
# define ZYAN_UNIX
# define ZYAN_POSIX
#elif defined(__posix)
# define ZYAN_POSIX
#else
# define ZYAN_UNKNOWN_PLATFORM
#endif
/* ============================================================================================== */
/* Kernel mode detection */
/* ============================================================================================== */
#if (defined(ZYAN_WINDOWS) && defined(_KERNEL_MODE)) || \
(defined(ZYAN_APPLE) && defined(KERNEL)) || \
(defined(ZYAN_LINUX) && defined(__KERNEL__)) || \
(defined(__FreeBSD_kernel__))
# define ZYAN_KERNEL
#else
# define ZYAN_USER
#endif
/* ============================================================================================== */
/* Architecture detection */
/* ============================================================================================== */
#if defined(_M_AMD64) || defined(__x86_64__)
# define ZYAN_X64
#elif defined(_M_IX86) || defined(__i386__)
# define ZYAN_X86
#elif defined(_M_ARM64) || defined(__aarch64__)
# define ZYAN_AARCH64
#elif defined(_M_ARM) || defined(_M_ARMT) || defined(__arm__) || defined(__thumb__)
# define ZYAN_ARM
#elif defined(__EMSCRIPTEN__)
// Nothing to do, `ZYAN_EMSCRIPTEN` is both platform and arch macro for this one.
#else
# error "Unsupported architecture detected"
#endif
/* ============================================================================================== */
/* Debug/Release detection */
/* ============================================================================================== */
#if defined(ZYAN_MSVC) || defined(ZYAN_BORLAND)
# ifdef _DEBUG
# define ZYAN_DEBUG
# else
# define ZYAN_RELEASE
# endif
#elif defined(ZYAN_GNUC) || defined(ZYAN_ICC)
# ifdef NDEBUG
# define ZYAN_RELEASE
# else
# define ZYAN_DEBUG
# endif
#else
# define ZYAN_RELEASE
#endif
/* ============================================================================================== */
/* Misc compatibility macros */
/* ============================================================================================== */
#if defined(ZYAN_MSVC) || defined(ZYAN_BORLAND)
# define ZYAN_INLINE __inline
#else
# define ZYAN_INLINE static inline
#endif
/* ============================================================================================== */
/* Debugging and optimization macros */
/* ============================================================================================== */
/**
* @brief Runtime debug assersion.
*/
#if defined(ZYAN_NO_LIBC)
# define ZYAN_ASSERT(condition) (void)(condition)
#elif defined(ZYAN_WINDOWS) && defined(ZYAN_KERNEL)
# include <wdm.h>
# define ZYAN_ASSERT(condition) NT_ASSERT(condition)
#else
# include <assert.h>
# define ZYAN_ASSERT(condition) assert(condition)
#endif
/**
* @brief Compiler-time assertion.
*/
#if __STDC_VERSION__ >= 201112L && !defined(__cplusplus)
# define ZYAN_STATIC_ASSERT(x) _Static_assert(x, #x)
#elif (defined(__cplusplus) && __cplusplus >= 201103L) || \
(defined(__cplusplus) && defined (_MSC_VER) && (_MSC_VER >= 1600)) || \
(defined (_MSC_VER) && (_MSC_VER >= 1800))
# define ZYAN_STATIC_ASSERT(x) static_assert(x, #x)
#else
# define ZYAN_STATIC_ASSERT(x) \
typedef int ZYAN_MACRO_CONCAT_EXPAND(ZYAN_SASSERT_, __COUNTER__) [(x) ? 1 : -1]
#endif
/**
* @brief Marks the current code path as unreachable.
*/
#if defined(ZYAN_RELEASE)
# if defined(ZYAN_CLANG) // GCC eagerly evals && RHS, we have to use nested ifs.
# if __has_builtin(__builtin_unreachable)
# define ZYAN_UNREACHABLE __builtin_unreachable()
# else
# define ZYAN_UNREACHABLE for(;;)
# endif
# elif defined(ZYAN_GCC) && ((__GNUC__ == 4 && __GNUC_MINOR__ > 4) || __GNUC__ > 4)
# define ZYAN_UNREACHABLE __builtin_unreachable()
# elif defined(ZYAN_ICC)
# ifdef ZYAN_WINDOWS
# include <stdlib.h> // "missing return statement" workaround
# define ZYAN_UNREACHABLE __assume(0); (void)abort()
# else
# define ZYAN_UNREACHABLE __builtin_unreachable()
# endif
# elif defined(ZYAN_MSVC)
# define ZYAN_UNREACHABLE __assume(0)
# else
# define ZYAN_UNREACHABLE for(;;)
# endif
#elif defined(ZYAN_NO_LIBC)
# define ZYAN_UNREACHABLE for(;;)
#elif defined(ZYAN_WINDOWS) && defined(ZYAN_KERNEL)
# define ZYAN_UNREACHABLE { __fastfail(0); for(;;){} }
#else
# include <stdlib.h>
# define ZYAN_UNREACHABLE { assert(0); abort(); }
#endif
/* ============================================================================================== */
/* Utils */
/* ============================================================================================== */
/* ---------------------------------------------------------------------------------------------- */
/* General purpose */
/* ---------------------------------------------------------------------------------------------- */
/**
* @brief Marks the specified parameter as unused.
*
* @param x The name of the unused parameter.
*/
#define ZYAN_UNUSED(x) (void)(x)
/**
* @brief Intentional fallthrough.
*/
#if defined(ZYAN_GCC) && __GNUC__ >= 7
# define ZYAN_FALLTHROUGH __attribute__((fallthrough))
#else
# define ZYAN_FALLTHROUGH
#endif
/**
* @brief Declares a bitfield.
*
* @param x The size (in bits) of the bitfield.
*/
#define ZYAN_BITFIELD(x) : x
/**
* @brief Marks functions that require libc (cannot be used with `ZYAN_NO_LIBC`).
*/
#define ZYAN_REQUIRES_LIBC
/**
* @brief Decorator for `printf`-style functions.
*
* @param format_index The 1-based index of the format string parameter.
* @param first_to_check The 1-based index of the format arguments parameter.
*/
#if defined(__RESHARPER__)
# define ZYAN_PRINTF_ATTR(format_index, first_to_check) \
[[gnu::format(printf, format_index, first_to_check)]]
#elif defined(ZYAN_GCC)
# define ZYAN_PRINTF_ATTR(format_index, first_to_check) \
__attribute__((format(printf, format_index, first_to_check)))
#else
# define ZYAN_PRINTF_ATTR(format_index, first_to_check)
#endif
/**
* @brief Decorator for `wprintf`-style functions.
*
* @param format_index The 1-based index of the format string parameter.
* @param first_to_check The 1-based index of the format arguments parameter.
*/
#if defined(__RESHARPER__)
# define ZYAN_WPRINTF_ATTR(format_index, first_to_check) \
[[rscpp::format(wprintf, format_index, first_to_check)]]
#else
# define ZYAN_WPRINTF_ATTR(format_index, first_to_check)
#endif
/* ---------------------------------------------------------------------------------------------- */
/* Arrays */
/* ---------------------------------------------------------------------------------------------- */
/**
* @brief Returns the length (number of elements) of an array.
*
* @param a The name of the array.
*
* @return The number of elements of the given array.
*/
#define ZYAN_ARRAY_LENGTH(a) (sizeof(a) / sizeof((a)[0]))
/* ---------------------------------------------------------------------------------------------- */
/* Arithmetic */
/* ---------------------------------------------------------------------------------------------- */
/**
* @brief Returns the smaller value of `a` or `b`.
*
* @param a The first value.
* @param b The second value.
*
* @return The smaller value of `a` or `b`.
*/
#define ZYAN_MIN(a, b) (((a) < (b)) ? (a) : (b))
/**
* @brief Returns the bigger value of `a` or `b`.
*
* @param a The first value.
* @param b The second value.
*
* @return The bigger value of `a` or `b`.
*/
#define ZYAN_MAX(a, b) (((a) > (b)) ? (a) : (b))
/**
* @brief Returns the absolute value of `a`.
*
* @param a The value.
*
* @return The absolute value of `a`.
*/
#define ZYAN_ABS(a) (((a) < 0) ? -(a) : (a))
/**
* @brief Checks, if the given value is a power of 2.
*
* @param x The value.
*
* @return `ZYAN_TRUE`, if the given value is a power of 2 or `ZYAN_FALSE`, if not.
*
* Note that this macro always returns `ZYAN_TRUE` for `x == 0`.
*/
#define ZYAN_IS_POWER_OF_2(x) (((x) & ((x) - 1)) == 0)
/**
* @brief Checks, if the given value is properly aligned.
*
* Note that this macro only works for powers of 2.
*/
#define ZYAN_IS_ALIGNED_TO(x, align) ((x & (align - 1)) == 0)
/**
* @brief Aligns the value to the nearest given alignment boundary (by rounding it up).
*
* @param x The value.
* @param align The desired alignment.
*
* @return The aligned value.
*
* Note that this macro only works for powers of 2.
*/
#define ZYAN_ALIGN_UP(x, align) (((x) + (align) - 1) & ~((align) - 1))
/**
* @brief Aligns the value to the nearest given alignment boundary (by rounding it down).
*
* @param x The value.
* @param align The desired alignment.
*
* @return The aligned value.
*
* Note that this macro only works for powers of 2.
*/
#define ZYAN_ALIGN_DOWN(x, align) (((x) - 1) & ~((align) - 1))
/* ---------------------------------------------------------------------------------------------- */
/* Bit operations */
/* ---------------------------------------------------------------------------------------------- */
/*
* @brief Checks, if the bit at index `b` is required to present the ordinal value `n`.
*
* @param n The ordinal value.
* @param b The bit index.
*
* @return `ZYAN_TRUE`, if the bit at index `b` is required to present the ordinal value `n` or
* `ZYAN_FALSE`, if not.
*
* Note that this macro always returns `ZYAN_FALSE` for `n == 0`.
*/
#define ZYAN_NEEDS_BIT(n, b) (((unsigned long)(n) >> (b)) > 0)
/*
* @brief Returns the number of bits required to represent the ordinal value `n`.
*
* @param n The ordinal value.
*
* @return The number of bits required to represent the ordinal value `n`.
*
* Note that this macro returns `0` for `n == 0`.
*/
#define ZYAN_BITS_TO_REPRESENT(n) \
( \
ZYAN_NEEDS_BIT(n, 0) + ZYAN_NEEDS_BIT(n, 1) + \
ZYAN_NEEDS_BIT(n, 2) + ZYAN_NEEDS_BIT(n, 3) + \
ZYAN_NEEDS_BIT(n, 4) + ZYAN_NEEDS_BIT(n, 5) + \
ZYAN_NEEDS_BIT(n, 6) + ZYAN_NEEDS_BIT(n, 7) + \
ZYAN_NEEDS_BIT(n, 8) + ZYAN_NEEDS_BIT(n, 9) + \
ZYAN_NEEDS_BIT(n, 10) + ZYAN_NEEDS_BIT(n, 11) + \
ZYAN_NEEDS_BIT(n, 12) + ZYAN_NEEDS_BIT(n, 13) + \
ZYAN_NEEDS_BIT(n, 14) + ZYAN_NEEDS_BIT(n, 15) + \
ZYAN_NEEDS_BIT(n, 16) + ZYAN_NEEDS_BIT(n, 17) + \
ZYAN_NEEDS_BIT(n, 18) + ZYAN_NEEDS_BIT(n, 19) + \
ZYAN_NEEDS_BIT(n, 20) + ZYAN_NEEDS_BIT(n, 21) + \
ZYAN_NEEDS_BIT(n, 22) + ZYAN_NEEDS_BIT(n, 23) + \
ZYAN_NEEDS_BIT(n, 24) + ZYAN_NEEDS_BIT(n, 25) + \
ZYAN_NEEDS_BIT(n, 26) + ZYAN_NEEDS_BIT(n, 27) + \
ZYAN_NEEDS_BIT(n, 28) + ZYAN_NEEDS_BIT(n, 29) + \
ZYAN_NEEDS_BIT(n, 30) + ZYAN_NEEDS_BIT(n, 31) \
)
/* ---------------------------------------------------------------------------------------------- */
/* ============================================================================================== */
#endif /* ZYCORE_DEFINES_H */
|
